
package priv.mill.httpclient.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URI;
import java.net.URLEncoder;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.ParseException;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

/**
 * HttpClient工具类
 */
@Component
public class HttpUtil {

	@Value("${charSet}")
	private String charSet;
	
	
	private static Logger logger = Logger.getLogger(HttpUtil.class);

	/**
	 * get请求
	 * 
	 * @return
	 * @throws IOException
	 * @throws ParseException
	 */
	public  String doGet(String url) throws ParseException, IOException {
		HttpClient client = HttpClients.createDefault();
		// 发送get请求
		HttpGet request = new HttpGet(url);
		HttpResponse response = client.execute(request);
		/** 请求发送成功，并得到响应 **/
		if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
			/** 读取服务器返回过来的json字符串数据 **/
			String strResult = EntityUtils.toString(response.getEntity());
			return strResult;
		}
		return null;
	}
	
	
	public  String doGet(String url,Map<String,Object> params) throws ParseException, IOException {
		StringBuilder stringBuilder = new StringBuilder();
		for (Entry<String, Object> element : params.entrySet()) {
			stringBuilder.append(element.getKey());
			stringBuilder.append("=");
			//TODO 这里要考虑各种数据类型的字符串格式化问题，比如日期
			stringBuilder.append(URLEncoder.encode(element.getValue().toString(),charSet));
			stringBuilder.append("&");
		}
		if(params.size()>0)
		url  =  url+"?"+stringBuilder.substring(0, stringBuilder.length()-1);
		return doGet(url);
	}

	/**
	 * post请求(用于key-value格式的参数)
	 * 
	 * @param url
	 * @param params
	 * @return
	 * @throws Exception
	 */
	public  String doPost(String url, Map<String, Object> params) throws Exception {

		BufferedReader in = null;
		// 定义HttpClient
		HttpClient client = HttpClients.createDefault();
		// 实例化HTTP方法
		HttpPost request = new HttpPost();
		request.setURI(new URI(url));

		// 设置参数
		List<NameValuePair> nvps = new ArrayList<NameValuePair>();
		for (Iterator<String> iter = params.keySet().iterator(); iter.hasNext();) {
			String name = (String) iter.next();
			String value = String.valueOf(params.get(name));
			nvps.add(new BasicNameValuePair(name, value));

		}
		request.setEntity(new UrlEncodedFormEntity(nvps, Charset.forName(charSet)));

		HttpResponse response = client.execute(request);
		int code = response.getStatusLine().getStatusCode();
		if (code == 200) { // 请求成功
			in = new BufferedReader(new InputStreamReader(response.getEntity().getContent(), charSet));
			StringBuffer sb = new StringBuffer("");
			String line = "";
			String NL = System.getProperty("line.separator");
			while ((line = in.readLine()) != null) {
				sb.append(line + NL);
			}

			in.close();

			return sb.toString();
		} else { //
			logger.error("状态码：" + code);
			return null;
		}
	}

	/**
	 * post请求（用于请求json格式的参数）
	 * 
	 * @param url
	 * @param jsonStr
	 * @return
	 */
	public  String doPost(String url, String jsonStr) throws Exception {

		try (CloseableHttpClient httpclient = HttpClients.createDefault();) {

			HttpPost httpPost = new HttpPost(url);// 创建httpPost
			httpPost.setHeader("Accept", "application/json");
			httpPost.setHeader("Content-Type", "application/json");
			StringEntity entity = new StringEntity(jsonStr, charSet);
			httpPost.setEntity(entity);
			try (CloseableHttpResponse response = httpclient.execute(httpPost);) {

				StatusLine status = response.getStatusLine();
				int state = status.getStatusCode();
				if (state == HttpStatus.SC_OK) {
					HttpEntity responseEntity = response.getEntity();
					String jsonString = EntityUtils.toString(responseEntity);
					return jsonString;
				} else {
					logger.error("请求返回:" + state + "(" + url + ")");
				}
			}
		}
		return null;
	}


}
